ox MYZOSTOMIDA FROM THE RED SEA. 85 



sufficiently account for the loss of the tubules in these fishes. 

 Obviously much remains to be done before the full significance 

 of the structure of bone can be elucidated, and this paper has 

 been written with the object of drawing attention to the interest 

 and importance of- this new line of research. 



List of ReJ'erences. 



1. Goodrich, E. S. — " On the Scales of Fish, Living and Extinct, 



Hud their Importance in Classification." Proc. Zool. 8oc. 

 1908. 



2. Goodrich, E. S. — " Vertebrata Oraniata" first fascicle — • 



Cyclostomes and Fishes. Part 9 of ' Treatise on Zoology,' 

 ed. by Sii' Ray Lankester. London, 1909. 



3. Hertwig, O. — " Ueber das Hautskelet der Fische." Morph. 



Jahrb. vol. v., 1879. 



4. NicKERSON, W. S.— " Development of the Scales of Lepkl- 



osteus" Bull. Mus. Comp. Zool. vol. xxiv., 1893. 



5. Reissner, E. — " Ueber d. Schuppen von Polypterus u. L^ind- 



osteus." Arch, f. Anat. u. Phys., 1859. 



6. Stewart, C — "Endoskeleton," inCatal. Roy. Coll. of Surgeons, 



2nd edit. vol. i., 1900. 



7. Woodward, A. S. — Catalogue of the Fossil Fishes in the British 



Museum, 4 vols., London, 1889-1901 ; and ' Outlines of 

 Vertebrate Pateontology,' Cambridge, 1898. 



7. Report on the Myzostomida collected by Mr. Cyril 

 Crossland in the Red Sea in 1905. By Charles L. 

 BouLENGER, M.A,, D.Sc., F.Z.S., Lecturer on Zoology 

 in the University of Birmingham. 



[Received November 12, 1912 : Read November 26, 1912.] 

 (Plates V.-VIII. and Text-figures 17-23.) 



Index. 



Page 



Anatomy of Mi/zostoma spp 88 



The " Suokevs '"' of 31. costatum F. S. L 90 



Ophiurid as the host oi M. costatum F. S. L 88 



Abnormalities in 31. costatum F. S. L 93 



31. costatum F. S. L 87 



31. ruhrofasciatimi v. Graff 101 



31. crosslandi, sp. n 102 



List of References 107 



Explanation of the Plates 108 



The Myzostomida described in this I'eport wei'e collected by 

 Mr. Cyril Crossland on the Sudanese coast of the Red Sea in 



